For Android users: Download the excellent, and well maintained Harmonic app and enable "Auto-collapse top level comments" to achieve the same BFS effect.

No need to download a new shareware app.

Thanks! As of now I don't have any plans for Android. It's a native iOS app written in Swift, so that would require building a new app from the ground up.

Don't know if you saw, but Swift is coming to Android. Might not require a rebuild after all.

Related: https://news.ycombinator.com/item?id=44387409